Arc soldering-iron.



M. DANKO.

ARC SOLDBRING IRON.

APPLICATION FILED 00T. 22, 1910.

IICHAEL DARKO, 0l' 'SOUTH BETHLEHEI, PENNSYLVANIA.

LBC SOLDEBING-'IBON. I

Speoloation of Letters Patent.

Patented July 4, 1911.

Application led (Ictober 22, 1910. lSerial No. 588,543.

To all wlw'm .it 'may concern:

Be it known that I, MlcHAEL DANKo, a subject of the Emperor of Austria-Hungary, residing at South Bethlehem, in the .county of Northampton and State 4of Pennsylvania, have invented certain new and useful Improvements in Arc Soldering-Irons, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to soldering and welding tools, and the principal object ofv the same is to provide a tool -of the character stated-which is heated from the interior byan electrical current to produce an arc by means of which the tool is quickly heated to a high degree.

This invention also contemplates novel means by which the current can be controlled so that the degree of heat within the tool can be regulated.

In carrying out the objects of the invention generally stated above it will be vunderstood, of course, that the essential features thereof are necessarily susceptible of changes in details and structural arrangements, certain preferred and practical embodiments of which are shown in the accompanying drawings, wherein:

Figure 1 is a longitudinal sectional view l of the improved tool, also showing diagrammatically the electrical circuit including a rheostat. Fig. 2 is a transverse sectional view taken on the line 2 2, Fig. 1.v Fig. 3 is a similar view taken on the line'3-3 Fig. 1. Fig. 4 is alongitudinal sectional view of a modified soldering head. Fig. 5 is a similar view of a tool adapted for welding.

Referring to the accompan ing drawings by numerals, and particular y to Figs. 1, 2, and 3 thereof, it will be observed that the improved tool comprises a hollow headv 1 provided with the usual pointed end 2. Said head is open` at the rear end and has-fitted therein a shell 3. The shell is insulated from the head by mica or other suitable insulating material 4. Said shell has an open rear end that is internally threaded. An internally threaded socket 5 is 4formed in the forward end of shell 3 for the reception of a plug 6 that has a stick of carbon 7 mounted therein. A hollow plu@` 8 is tted in the open rear end of shell 3 and is provided with a flange 9 that abuts the outerl surface of said open rear end. An elongated sleeve 10 of iron or steel projects from said plug 8 and -extends into a handle 1l and is suitably fastened therein. The rear end of handle 11 has a sleeve 12 projecting therefrom and said sleeve has the open end of a cylindrical-Casin 13 fastened thereto. Said casing 13 projects into the rear end 0f sleeve 12. An external] hollow core 14 is slidable throug casing 13 and sleeve 12 and ro'ects into a chamber 15 formed longitudinally inthe handle 11. The inner end of core 14 is internally threaded for the reception of the externally threaded end of a bar of insulating material 16 that extends into the sleeve 10. Core 14 carries an abutment disk 17 which cont-acts with handle 11 to limit the movement of core 14 in one direction and with the open end of casing 13 to, limit the movement of said core in an opposite direction. A spring 18 is coiled about core 14 within chamber 15, one end of said spring bearing against an abutment flange 19 carried by bar 16, the other end thereof 'bea-ring against a guide collar 20 -fitted. within said chamber 15. A conductor rod 21 has one end seated in 4bar 16 said rod extending through sleeve 10 and through a block of insulating material 21l in said sleeve which centers said rod. The rod 21 terminates in plug 8 and enters the rear end of a socket 22, and connects with a feed wire 22EL that extends longitudinally of said socket. Socket 22 carries a carbonv stick 23 one end of which is connected with wire 22. Said stick 23 is in alinement with and adjacent carbon stick 7.

As will be understood from the foregoing, the spring 18 normally tends to slide the core 14, rod .21, socket 22, and carbon stick 23 so that said stick 23 will be in contact with carbon stick 7. And to rovide the arc between said sticks for heatlng the soldering head, itis necessary to slide core 14, lrod 21, socket 22 and stick 7 against the tension of spring 18 so that the sticks 7 and 23 will be separated. This last mentioned movement 1s obtained by magnetizing the core 14 within casing 13, as will now be explained.

The current is supplied through the circuit-wires 24 and 25 which are in circuitwith a rheostat 26. From said rheostat, wire 24 extends to and through an insulated opening 27 in the rear end of casing 13 and is wound about core 14 within said casing threaded l 10 and into bar 16 and connects with rod 21.

The other wire 25 extends from the rheostat 26 to the sleeve 10 at apoint adjacent the front end of handle 11. This arrangement obviously magnetizes core 14 so that sticks 7 and 23 will be separated andv also completes the circuit so that an arc will be formed by contacts 34 and 35.

said sticks. The rheostat is interposed between the source of electrical supply and the wires 24 and 25 and is composed of the insulated end disks 31 and 32 which are connected by a bar 33. Disk 31 carries the Contact 34 is in circuit with the windings of the rheostat and con# tact 35 is in' circuit with the bar 33. An adjustable contact 36 is slidable on bar 33 and is adapted to selectively close the circuit between the windings of the rheostat to vary the resistance thereof. End disk 32 is provided with contacts 37 and 38 to which wires 24 and 25 are connected.

As will be clear from the foregoing this invention provides means whereby an arc is formed in the soldering head which will quickly heat said head to a high degree.

In Fig. 4 a modified type of soldering head 39 is provided in which the free end is provided with a flattened external portion 40 producing a chisel-shaped point which especially adapts the head for use in soldering interior corners of articles.

In Fig. 5 the head 41 is open and the shell 42 carries an outstanding lug 43 in which a carbon stick 44 is carried. The other carbon stick 45 is carried by a socket 46 in the same manner as that set forth in connection with the preferred form of the invent-ion; The tool in this form of the invention is especially adapted for welding, and it will be clear that the open shell andr head will readily permit the work to -be held in the larc between the two sticks 44 and 45.

prising a head, a shell therein means forinsulating said shell from said head, and

shell.

2. A tool of the character described comprlslng a head, a shelltherein, means for inelectrical means for producing an are in said sulating the shell from said head, a carbon stick stationary in said shell, an adjustable carbon stick in said shell, and means for producing an arc between adjacent ends of said sticks.

3. A tool of the character described com-- vshell and head, and heating means in said head.

5. A tool of the character described comprising a head, a shell therein, insulating means interposed between said head and shell, said shell having a socket in one end, a plug in said socket, a carbon stick carried by said plug, a plug sealing the other end of said shell, a carbon stick adjustable 1n said sealing plug, and electrical means for producing an arc between adjacent ends of said sticks.

6. A soldering iron comprising a hollow head having an open rear end, a shell in said head, insulating means interposed between said head and shell, a carbon stick in the forward end of said shell, a hollow plug fitted in the rear end of said shell, a conductor rod extending through said plug, a socket carried by said rod wit-hin the shell, a carbon stick carried by said socket, means for normally holding the carbon sticks in contact, an electrical circuit including said sticks, and 'a magnet in said circuit for separating said sticks to produce an are in said shell.

In testimony whereof I hereunto aflix my signature in presence of two witnesses.

MICHAEL DANKO. 

